Clean up translated message clobbering in NumberRange and Optional validators. Refs #161, #168.
Clean up translated message clobbering in NumberRange and Optional validators. Refs #161, #168.

wtforms/wtforms,pawl/wtforms,Aaron1992/wtforms,cklein/wtforms,Aaron1992/wtforms,Xender/wtforms,pawl/wtforms,jmagnusson/wtforms,hsum/wtforms,crast/wtforms,skytreader/wtforms,subyraman/wtforms